[racket-dev] plot doesn't plot (inexact->exact: no exact representation for +nan.0)

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So I just wanted to repost this to dev for the record.

The program:

;== start
#lang racket

(require plot)

;(plot3d-diffuse-light? #f)
;(plot3d-specular-light? #f)

(plot3d (list (surface3d (λ (x y) (+ (sqr x) (sqr y))) -1 1 -1 1
                           #:label "z = x^2 + y^2")
                (surface3d (λ (x y) (- (+ (sqr x) (sqr y)))) -1 1 -1 1
                           #:color 4 #:line-color 4
                           #:label "z = -x^2 - y^2")))
;== end

produces:

inexact->exact: no exact representation for +nan.0

but when the commented lines are uncommented it does plot. The plot
looks plausible, though apparently it should be possible to drag
inside the plot area to change the view. This is not possible for me;
the view is stuck from looking along the xy-plane onto the z-axis.

Matthew has been trying to determine the cause via private email.
Matthew, has any of the data I provided so far pointed you anywhere?
Otherwise is there something else I can do to help debug?

Marijn
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